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A comment on My Homebrew Z80 Microcomputer. Parent comment

Re:My Homebrew Z80 Microcomputer by jdmoreira on Sunday February 12, 2017 @05:17PM (#13631336)
A lot of the ZX Spectrum functionality and logic is in the ULA, an ASIC.

There's a whole book on the ULA - http://www.zxdesign.info/book/theZXSpectrumULA.shtml

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Re:My Homebrew Z80 Microcomputer by dfox on Sunday February 12, 2017 @06:02PM (#13631654)
Actually there is now design out of 74ls series logic that replicates functionality of the ULA (it is probably completely bug-for-bug compatible), IIRC it was designed by author of said book.
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